/*
 * Copyright (c) 2014 pkzd/1.0, 颜文泽(robin)
 * All rights reserved.
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *     1 Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     2 Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include	<asm.h>
#include	<pic.h>

static ushort picocw1;

void
pic_setirq(void)
{
	outb((uchar)picocw1, PIC1_DAT);
	outb((uchar)(picocw1 >> 8), PIC2_DAT);
}

void
pic_mskirq(uint irq)
{
	picocw1 |= (1 << irq);
	pic_setirq();
}

void
pic_eblirq(uint irq)
{
	picocw1 &= ~(1 << irq);
	pic_setirq();
}

void
pic_init(void)
{
	outb(0x11, PIC1_CMD);
	outb(PIC1_IRQ, PIC1_DAT);
	outb(0x4, PIC1_DAT);
	outb(0x1, PIC1_DAT);
	outb(0x11, PIC2_CMD);
	outb(PIC2_IRQ, PIC2_DAT);
	outb(0x2, PIC2_DAT);
	outb(0x1, PIC2_DAT);
	picocw1 = PIC_MASK;
	pic_setirq();
}
